Can I still smash it to get a new battledome challenger? Or is that over. Judy

To my knowledge it works all year round, I think I unlocked it about 6 months ago :)

Great and thanks. I am looking for more challengers that do not cost a fortune. Judy

I have a challengers guide which lists all the loot of the permanent challengers, but it also has info on how to unlock them. The guide can be found here, but it's a bit image heavy, so it might take quite some time to load. If you're looking for challengers that do not cost a lot, you may try to unlock Angry Angry Arnold by playing the fishing game, or unlock Coeli by using the Note Encased Coal, or Nightshade by looking on the main page of Dark Matter Dice. There are also some challengers found in the Nature Hike.

Thanks so very much!!!